Error during startup:

[EvgeniyGogolevskiy]

 Starting broker...
BOOT FAILED
===========
Error during startup: {error,
                       {rabbitmq_management_agent,
                        {{shutdown,
                          {failed_to_start_child,rabbit_mgmt_agent_sup,
                           {shutdown,
                            {failed_to_start_child,
                             rabbit_mgmt_external_stats,
                             {badarg,
                              [{erlang,list_to_binary,
                                [[99,58,47,85,115,101,114,115,47,1045,1074,
                                  1075,1077,1085,1080,1081,47,65,112,112,68,
                                  97,116,97,47,82,111,97,109,105,110,103,47,
                                  82,97,98,98,105,116,77,81,47,108,111,103,47,
                                  114,97,98,98,105,116,64,76,65,80,84,79,80,
                                  45,56,86,72,86,86,80,75,73,46,108,111,103]],
                                [{error_info,#{module => erl_erts_errors}}]},
                               {rabbit_mgmt_external_stats,'-i/2-lc$^0/1-0-',
                                1,
                                [{file,"rabbit_mgmt_external_stats.erl"},
                                 {line,276}]},
                               {rabbit_mgmt_external_stats,'-i/2-lc$^0/1-0-',
                                1,
                                [{file,"rabbit_mgmt_external_stats.erl"},
                                 {line,276}]},
                               {rabbit_mgmt_external_stats,i,2,
                                [{file,"rabbit_mgmt_external_stats.erl"},
                                 {line,276}]},
                               {rabbit_mgmt_external_stats,infos,3,
                                [{file,"rabbit_mgmt_external_stats.erl"},
                                 {line,226}]},
                               {rabbit_mgmt_external_stats,emit_update,1,
                                [{file,"rabbit_mgmt_external_stats.erl"},
                                 {line,425}]},
                               {rabbit_mgmt_external_stats,init,1,
                                [{file,"rabbit_mgmt_external_stats.erl"},
                                 {line,401}]},
                               {gen_server,init_it,2,
                                [{file,"gen_server.erl"},{line,848}]}]}}}}},
                         {rabbit_mgmt_agent_app,start,[normal,[]]}}}}

{"init terminating in do_boot",{error,{rabbitmq_management_agent,{{shutdown,{failed_to_start_child,rabbit_mgmt_agent_sup,{shutdown,{failed_to_start_child,rabbit_mgmt_external_stats,{badarg,[{erlang,list_to_binary,[[99,58,47,85,115,101,114,115,47,1045,1074,1075,1077,1085,1080,1081,47,65,112,112,68,97,116,97,47,82,111,97,109,105,110,103,47,82,97,98,98,105,116,77,81,47,108,111,103,47,114,97,98,98,105,116,64,76,65,80,84,79,80,45,56,86,72,86,86,80,75,73,46,108,111,103]],[{error_info,#{module=>erl_erts_errors}}]},{rabbit_mgmt_external_stats,'-i/2-lc$^0/1-0-',1,[{file,"rabbit_mgmt_external_stats.erl"},{line,276}]},{rabbit_mgmt_external_stats,'-i/2-lc$^0/1-0-',1,[{file,"rabbit_mgmt_external_stats.erl"},{line,276}]},{rabbit_mgmt_external_stats,i,2,[{file,"rabbit_mgmt_external_stats.erl"},{line,276}]},{rabbit_mgmt_external_stats,infos,3,[{file,"rabbit_mgmt_external_stats.erl"},{line,226}]},{rabbit_mgmt_external_stats,emit_update,1,[{file,"rabbit_mgmt_external_stats.erl"},{line,425}]},{rabbit_mgmt_external_stats,init,1,[{file,"rabbit_mgmt_external_stats.erl"},{line,401}]},{gen_server,init_it,2,[{file,"gen_server.erl"},{line,848}]}]}}}}},{rabbit_mgmt_agent_app,start,[normal,[]]}}}}}
init terminating in do_boot ({error,{rabbitmq_management_agent,{{shutdown,{_}},{rabbit_mgmt_agent_app,start,[_]}}}})

Crash dump is being written to: c:/Users/┼тухэшщ/AppData/Roaming/RabbitMQ/log/erl_crash.dump...done

[michaelklishin]

I'm afraid we do not have much information to reason about this exception. All we can tell
is that a management plugin module fails to convert a data type when booting on Windows.

There is no RabbitMQ or Erlang version information, no details if this was an upgrade, and so on.

I can reproduce this exception if I use the value as is:

S = [99,58,47,85,115,101,114,115,47,1045,1074,
1075,1077,1085,1080,1081,47,65,112,112,68,
97,116,97,47,82,111,97,109,105,110,103,47,
82,97,98,98,105,116,77,81,47,108,111,103,47,
114,97,98,98,105,116,64,76,65,80,84,79,80,
45,56,86,72,86,86,80,75,73,46,108,111,103].

and it indeed cannot be formatted as a string any way I try. It includes values such as 1045 and 1074 which technically do fit into the code point space but are a bit high for most encodings I had to deal with.
What is even more surprising is that this "external stats" module does not read any data on disk,
so it must come from a value produced at boot time.

Looking at the code suggests these lines:

i(log_files, State) ->
    {State, [list_to_binary(F) || F <- rabbit:log_locations()]};

so the log location path is encoded in a way that is not compatible with supervisor child ID names the runtime supports. Paths with non-ASCII characters are known to be problematic and highly not recommended. This is indeed
a Windows-specific problem in practice.

You can disable the plugin and use Prometheus instead or use an installation and node data directory that only has ASCII characters.

That's as much as I can recommend with a single stack trace and no other details to work with.

[lukebakken]

@michaelklishin you're correct, it is due to the user account name on Windows:

1> S = [99,58,47,85,115,101,114,115,47,1045,1074, 1075,1077,1085,1080,1081,47,65,112,112,68, 97,116,97,47,82,111,97,109,105,110,103,47, 82,97,98,98,105,116,77,81,47,108,111,103,47, 114,97,98,98,105,116,64,76,65,80,84,79,80, 45,56,86,72,86,86,80,75,73,46,108,111,103].
[99,58,47,85,115,101,114,115,47,1045,1074,1075,1077,1085,
 1080,1081,47,65,112,112,68,97,116,97,47,82,111,97,109|...]
2> io:format("~ts~n",[unicode:characters_to_binary(S)]).
c:/Users/\x{415}\x{432}\x{433}\x{435}\x{43D}\x{438}\x{439}/AppData/Roaming/RabbitMQ/log/[email protected]
ok

Code point 1045 is a Cyrillic character (https://www.ssec.wisc.edu/~tomw/java/unicode.html). The hex codes in the output is the result of UTF-8 encoding the code points.

At any rate, #5551 should (might?) fix this?

[michaelklishin]

Yup, it would be great if we could test it. I can supply you with any number of Cyrillic characters, LMK :)

[lukebakken]

#5551 appears to fix the issue:

[michaelklishin]

We can ship this in 3.11.1 or another early 3.11 patch after 3.11.0 ships.